WO2012115472A2 - Procédé et dispositif pour transmettre des données dans un système de communication sans fil - Google Patents

Procédé et dispositif pour transmettre des données dans un système de communication sans fil Download PDF

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Publication number
WO2012115472A2
WO2012115472A2 PCT/KR2012/001403 KR2012001403W WO2012115472A2 WO 2012115472 A2 WO2012115472 A2 WO 2012115472A2 KR 2012001403 W KR2012001403 W KR 2012001403W WO 2012115472 A2 WO2012115472 A2 WO 2012115472A2
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srs
subframe
pusch
pucch
allocated
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PCT/KR2012/001403
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English (en)
Korean (ko)
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WO2012115472A3 (fr
Inventor
노민석
한승희
고현수
정재훈
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엘지전자 주식회사
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Priority to US14/001,439 priority Critical patent/US20130336226A1/en
Publication of WO2012115472A2 publication Critical patent/WO2012115472A2/fr
Publication of WO2012115472A3 publication Critical patent/WO2012115472A3/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers

Definitions

  • the present invention relates to wireless communication, and more particularly, to a data transmission method and apparatus in a wireless communication system.
  • a wireless communication system it is necessary to estimate an uplink channel or a downlink channel for data transmission / reception, system synchronization acquisition, channel information feedback, and the like.
  • fading occurs due to a multipath time delay.
  • the process of restoring the transmission signal by compensating for the distortion of the signal caused by a sudden environmental change due to fading is called channel estimation.
  • channel estimation it is necessary to measure the channel state (channel state) for the cell to which the terminal belongs or other cells.
  • channel estimation is generally performed by using a reference signal (RS) that the transceiver knows from each other.
  • RS reference signal
  • a subcarrier used for transmitting a reference signal is called a reference signal subcarrier, and a resource element used for data transmission is called a data subcarrier.
  • reference signals are allocated to all subcarriers and between data subcarriers.
  • the method of allocating a reference signal to all subcarriers uses a signal consisting of only a reference signal, such as a preamble signal, in order to obtain a gain of channel estimation performance.
  • a reference signal such as a preamble signal
  • channel estimation performance may be improved as compared with the method of allocating the reference signal between data subcarriers.
  • a method of allocating reference signals between data subcarriers is used to increase the data transmission amount. In this method, since the density of the reference signal decreases, degradation of channel estimation performance occurs, and an appropriate arrangement for minimizing this is required.
  • the channel estimate estimated using the reference signal p Is The accuracy depends on the value. Therefore, for accurate estimation of h value Must be converged to 0. To do this, a large number of reference signals are used to estimate the channel. Minimize the impact. There may be various algorithms for good channel estimation performance.
  • the uplink reference signal may be divided into a demodulation reference signal (DMRS) and a sounding reference signal (SRS).
  • DMRS is a reference signal used for channel estimation for demodulation of a received signal.
  • DMRS may be combined with transmission of a physical uplink shared channel (PUSCH) or a physical uplink cnotrol channel (PUCCH).
  • PUSCH physical uplink shared channel
  • PUCCH physical uplink cnotrol channel
  • the SRS is a reference signal transmitted by the terminal to the base station for uplink scheduling.
  • the base station estimates an uplink channel through the received SRS, and uses the estimated uplink channel for uplink scheduling.
  • the SRS may be transmitted periodically or induced by the base station when the base station needs to transmit the SRS and may be transmitted aperiodicly.
  • the subframe configured to transmit the SRS may be predetermined.
  • the subframe configured to transmit the SRS may be a subframe to which both PUSCH and PUCCH are simultaneously allocated.
  • An object of the present invention is to provide a data transmission method and apparatus in a wireless communication system.
  • the present invention provides an operation of a terminal when a subframe configured to transmit an aperiodic SRS overlaps a subframe in which a PUSCH and a PUCCH are simultaneously allocated.
  • a method for transmitting data by a user equipment (UE) in a wireless communication system transmits a channel quality indicator (CQI) to a base station through a physical uplink control channel (PUCCH) allocated in a UE-specific sounding reference signal (SRS) subframe. And transmitting uplink (UL) data through a physical uplink shared channel (PUSCH) allocated in the SRS subframe, wherein the SRS subframe is a subframe to which the PUSCH and the PUCCH are simultaneously allocated.
  • the SRS subframe includes an SRS single carrier frequency division multiple access (SC-FDMA) symbol reserved for SRS transmission.
  • SC-FDMA single carrier frequency division multiple access
  • the SRS subframe may be a subframe in which an aperiodic SRS may be transmitted.
  • the PUCCH may be in a PUCCH format 2 / 2a / 2b.
  • the SRS SC-FDMA symbol may be the last SC-FDMA symbol of the SRS subframe.
  • SRS may not be transmitted through the SRS SC-FDMA symbol.
  • the PUSCH and the PUCCH may be allocated over the entire SRS subframe.
  • Rate matching may not be performed on the PUSCH.
  • a terminal in a wireless communication system.
  • the terminal includes a radio frequency (RF) unit for transmitting or receiving a radio signal, and a processor connected to the RF unit, wherein the processor includes a UE-specific sounding reference signal (SRS).
  • signal transmits a channel quality indicator (CQI) to a base station through a physical uplink control channel (PUCCH) allocated in a subframe and uplink (UL) through a physical uplink shared channel (PUSCH) allocated in the SRS subframe
  • PUCCH physical uplink control channel
  • PUSCH physical uplink shared channel
  • SRS subframe is a subframe in which the PUSCH and the PUCCH are allocated at the same time
  • the SRS subframe is a SRS single carrier frequency division multiple access (SC-FDMA) symbol reserved for SRS transmission.
  • SC-FDMA single carrier frequency division multiple access
  • Loss of data performance gain of the PUSCH can be minimized, and no ambiguity about PUSCH rate matching between the terminal and the base station occurs.
  • 1 is a wireless communication system.
  • FIG. 2 shows a structure of a radio frame in 3GPP LTE.
  • FIG 3 shows an example of a resource grid for one downlink slot.
  • 5 shows a structure of an uplink subframe.
  • FIG. 6 is an example of a transmitter and a receiver configuring a carrier aggregation system.
  • FIG. 7 and 8 illustrate another example of a transmitter and a receiver constituting a carrier aggregation system.
  • 10 is an example of a process of processing a UL-SCH transport channel.
  • 11 is an example of configuration of aperiodic SRS and PUSCH in an SRS subframe.
  • 12 is an example of configuration of aperiodic SRS and PUCCH in an SRS subframe.
  • FIG. 14 is a block diagram of a base station and a terminal in which an embodiment of the present invention is implemented.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • CDMA may be implemented by a radio technology such as universal terrestrial radio access (UTRA) or CDMA2000.
  • TDMA may be implemented with wireless technologies such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE).
  • GSM global system for mobile communications
  • GPRS general packet radio service
  • EDGE enhanced data rates for GSM evolution
  • OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA).
  • IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e.
  • UTRA is part of a universal mobile telecommunications system (UMTS).
  • 3rd generation partnership project (3GPP) long term evolution (LTE) is part of evolved UMTS (E-UMTS) using evolved-UMTS terrestrial radio access (E-UTRA), which employs OFDMA in downlink and SC in uplink -FDMA is adopted.
  • LTE-A evolution of 3GPP LTE.
  • 1 is a wireless communication system.
  • the wireless communication system 10 includes at least one base station (BS) 11.
  • Each base station 11 provides a communication service for a particular geographic area (generally called a cell) 15a, 15b, 15c.
  • the cell can in turn be divided into a number of regions (called sectors).
  • the UE 12 may be fixed or mobile and may have a mobile station (MS), a mobile terminal (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, or a PDA. (personal digital assistant), wireless modem (wireless modem), a handheld device (handheld device) may be called other terms.
  • the base station 11 generally refers to a fixed station communicating with the terminal 12, and may be called in other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like. have.
  • eNB evolved-NodeB
  • BTS base transceiver system
  • access point and the like. have.
  • a terminal typically belongs to one cell, and a cell to which the terminal belongs is called a serving cell.
  • a base station that provides a communication service for a serving cell is called a serving BS. Since the wireless communication system is a cellular system, there are other cells adjacent to the serving cell. Another cell adjacent to the serving cell is called a neighbor cell.
  • a base station that provides communication service for a neighbor cell is called a neighbor BS. The serving cell and the neighbor cell are relatively determined based on the terminal.
  • downlink means communication from the base station 11 to the terminal 12
  • uplink means communication from the terminal 12 to the base station 11.
  • the transmitter may be part of the base station 11 and the receiver may be part of the terminal 12.
  • the transmitter may be part of the terminal 12 and the receiver may be part of the base station 11.
  • the wireless communication system may be any one of a multiple-input multiple-output (MIMO) system, a multiple-input single-output (MIS) system, a single-input single-output (SISO) system, and a single-input multiple-output (SIMO) system.
  • MIMO multiple-input multiple-output
  • MIS multiple-input single-output
  • SISO single-input single-output
  • SIMO single-input multiple-output
  • the MIMO system uses a plurality of transmit antennas and a plurality of receive antennas.
  • the MISO system uses multiple transmit antennas and one receive antenna.
  • the SISO system uses one transmit antenna and one receive antenna.
  • the SIMO system uses one transmit antenna and multiple receive antennas.
  • a transmit antenna means a physical or logical antenna used to transmit one signal or stream
  • a receive antenna means a physical or logical antenna used to receive one signal or stream.
  • FIG. 2 shows a structure of a radio frame in 3GPP LTE.
  • a radio frame consists of 10 subframes, and one subframe consists of two slots. Slots in a radio frame are numbered with slots # 0 through # 19. The time taken for one subframe to be transmitted is called a transmission time interval (TTI). TTI may be referred to as a scheduling unit for data transmission. For example, one radio frame may have a length of 10 ms, one subframe may have a length of 1 ms, and one slot may have a length of 0.5 ms.
  • One slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and a plurality of subcarriers in the frequency domain.
  • the OFDM symbol is used to represent one symbol period since 3GPP LTE uses OFDMA in downlink, and may be called a different name according to a multiple access scheme.
  • SC-FDMA when SC-FDMA is used as an uplink multiple access scheme, it may be referred to as an SC-FDMA symbol.
  • a resource block (RB) includes a plurality of consecutive subcarriers in one slot in resource allocation units.
  • the structure of the radio frame is merely an example. Accordingly, the number of subframes included in the radio frame, the number of slots included in the subframe, or the number of OFDM symbols included in the slot may be variously changed.
  • 3GPP LTE defines that one slot includes 7 OFDM symbols in a normal cyclic prefix (CP), and one slot includes 6 OFDM symbols in an extended CP. .
  • CP normal cyclic prefix
  • Wireless communication systems can be largely divided into frequency division duplex (FDD) and time division duplex (TDD).
  • FDD frequency division duplex
  • TDD time division duplex
  • uplink transmission and downlink transmission are performed while occupying different frequency bands.
  • uplink transmission and downlink transmission are performed at different times while occupying the same frequency band.
  • the channel response of the TDD scheme is substantially reciprocal. This means that the downlink channel response and the uplink channel response are almost the same in a given frequency domain. Therefore, in a TDD based wireless communication system, the downlink channel response can be obtained from the uplink channel response.
  • the uplink transmission and the downlink transmission are time-divided in the entire frequency band, and thus the downlink transmission by the base station and the uplink transmission by the terminal cannot be simultaneously performed.
  • uplink transmission and downlink transmission are performed in different subframes.
  • FIG 3 shows an example of a resource grid for one downlink slot.
  • the downlink slot includes a plurality of OFDM symbols in the time domain and N RB resource blocks in the frequency domain.
  • the number N RB of resource blocks included in the downlink slot depends on the downlink transmission bandwidth set in the cell. For example, in the LTE system, N RB may be any one of 60 to 110.
  • One resource block includes a plurality of subcarriers in the frequency domain.
  • the structure of the uplink slot may also be the same as that of the downlink slot.
  • Each element on the resource grid is called a resource element.
  • an exemplary resource block includes 7 ⁇ 12 resource elements including 7 OFDM symbols in the time domain and 12 subcarriers in the frequency domain, but the number of OFDM symbols and the number of subcarriers in the resource block is equal to this. It is not limited. The number of OFDM symbols and the number of subcarriers can be variously changed according to the length of the CP, frequency spacing, and the like. For example, the number of OFDM symbols is 7 for a normal CP and the number of OFDM symbols is 6 for an extended CP. The number of subcarriers in one OFDM symbol may be selected and used among 128, 256, 512, 1024, 1536 and 2048.
  • the downlink subframe includes two slots in the time domain, and each slot includes seven OFDM symbols in the normal CP.
  • the leading up to 3 OFDM symbols (up to 4 OFDM symbols for 1.4Mhz bandwidth) of the first slot in the subframe are the control regions to which control channels are allocated, and the remaining OFDM symbols are the PDSCH (Physical Downlink Shared Channel). Becomes the data area to be allocated.
  • the PDCCH includes a resource allocation and transmission format of a downlink-shared channel (DL-SCH), resource allocation information of an uplink shared channel (UL-SCH), paging information on a paging channel (PCH), system information on a DL-SCH, and a PDSCH.
  • Resource allocation of higher layer control messages such as transmitted random access responses, set of transmit power control commands for individual UEs in any UE group, activation of voice over internet protocol (VoIP), and the like.
  • a plurality of PDCCHs may be transmitted in the control region, and the terminal may monitor the plurality of PDCCHs.
  • the PDCCH is transmitted on an aggregation of one or several consecutive control channel elements (CCEs).
  • CCEs control channel elements
  • CCE is a logical allocation unit used to provide a PDCCH with a coding rate according to a state of a radio channel.
  • the CCE corresponds to a plurality of resource element groups.
  • the format of the PDCCH and the number of bits of the PDCCH are determined according to the correlation between the number of CCEs and the coding rate provided by the CCEs.
  • the base station determines the PDCCH format according to the DCI to be sent to the terminal, and attaches a cyclic redundancy check (CRC) to the control information.
  • CRC cyclic redundancy check
  • RNTI a unique radio network temporary identifier
  • the PDCCH is for a specific terminal, a unique identifier of the terminal, for example, a cell-RNTI (C-RNTI) may be masked to the CRC.
  • C-RNTI cell-RNTI
  • a paging indication identifier for example, p-RNTI (P-RNTI) may be masked to the CRC.
  • SI-RNTI system information-RNTI
  • RA-RNTI random access-RNTI
  • 5 shows a structure of an uplink subframe.
  • the uplink subframe may be divided into a control region and a data region in the frequency domain.
  • the control region is allocated a physical uplink control channel (PUCCH) for transmitting uplink control information.
  • the data region is allocated a physical uplink shared channel (PUSCH) for transmitting data.
  • the terminal may support simultaneous transmission of the PUSCH and the PUCCH.
  • PUCCH for one UE is allocated to an RB pair in a subframe.
  • Resource blocks belonging to a resource block pair occupy different subcarriers in each of the first slot and the second slot.
  • the frequency occupied by the resource block belonging to the resource block pair allocated to the PUCCH is changed based on a slot boundary. This is called that the RB pair allocated to the PUCCH is frequency-hopped at the slot boundary.
  • the terminal may obtain a frequency diversity gain by transmitting uplink control information through different subcarriers over time.
  • m is a location index indicating a logical frequency domain location of a resource block pair allocated to a PUCCH in a subframe.
  • the uplink control information transmitted on the PUCCH includes a hybrid automatic repeat request (HARQ) acknowledgment (ACK) / non-acknowledgement (NACK), a channel quality indicator (CQI) indicating a downlink channel state, and an uplink radio resource allocation request. (scheduling request).
  • HARQ hybrid automatic repeat request
  • ACK acknowledgment
  • NACK non-acknowledgement
  • CQI channel quality indicator
  • the PUSCH is mapped to the UL-SCH, which is a transport channel.
  • the uplink data transmitted on the PUSCH may be a transport block which is a data block for the UL-SCH transmitted during the TTI.
  • the transport block may be user information.
  • the uplink data may be multiplexed data.
  • the multiplexed data may be a multiplexed transport block and control information for the UL-SCH.
  • control information multiplexed with data may include a CQI, a precoding matrix indicator (PMI), a HARQ, a rank indicator (RI), and the like.
  • the uplink data may consist of control information only.
  • 3GPP LTE-A supports a carrier aggregation system.
  • the carrier aggregation system may refer to 3GPP TR 36.815 V9.0.0 (2010-3).
  • the carrier aggregation system refers to a system in which one or more carriers having a bandwidth smaller than the target broadband is configured to configure the broadband when the wireless communication system attempts to support the broadband.
  • the carrier aggregation system may be called another name such as a bandwidth aggregation system.
  • the carrier aggregation system may be classified into a contiguous carrier aggregation system in which each carrier is continuous and a non-contiguous carrier aggregation system in which each carrier is separated from each other. In a continuous carrier aggregation system, frequency spacing may exist between each carrier.
  • a target carrier may use the bandwidth used by the existing system as it is for backward compatibility with the existing system.
  • bandwidths of 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, and 20 MHz are supported, and in 3GPP LTE-A, a bandwidth of 20 MHz or more can be configured using only the bandwidth of the 3GPP LTE system.
  • broadband can be configured by defining new bandwidth without using the bandwidth of the existing system.
  • the UE may simultaneously transmit or receive one or a plurality of carriers according to its capacity.
  • the LTE-A terminal may transmit or receive a plurality of carriers at the same time.
  • the LTE rel-8 terminal may transmit or receive only one carrier when each carrier constituting the carrier aggregation system is compatible with the LTE rel-8 system. Therefore, when at least the number of carriers used in the uplink and the downlink is the same, all component carriers need to be configured to be compatible with the LTE rel-8.
  • the plurality of carriers may be managed by media access control (MAC).
  • MAC media access control
  • both the transmitter and the receiver should be able to transmit / receive the plurality of carriers.
  • FIG. 6 is an example of a transmitter and a receiver configuring a carrier aggregation system.
  • one MAC manages and operates all n carriers to transmit and receive data.
  • the same is true of the receiver of Fig. 6- (b).
  • There may be one transport block and one HARQ entity per component carrier from the receiver's point of view.
  • the terminal may be scheduled for a plurality of carriers at the same time.
  • the carrier aggregation system of FIG. 6 may be applied to both a continuous carrier aggregation system and a discontinuous carrier aggregation system.
  • Each carrier managed by one MAC does not need to be adjacent to each other, and thus has an advantage in that it is flexible in terms of resource management.
  • FIG. 7 and 8 illustrate another example of a transmitter and a receiver constituting a carrier aggregation system.
  • one MAC manages only one carrier. That is, MAC and carrier correspond one-to-one.
  • MAC and carrier correspond to one-to-one for some carriers, and one MAC controls a plurality of carriers for the remaining carriers. That is, various combinations are possible due to the correspondence between the MAC and the carrier.
  • the carrier aggregation system of FIGS. 6 to 8 includes n carriers, and each carrier may be adjacent to or separated from each other.
  • the carrier aggregation system may be applied to both uplink and downlink.
  • each carrier is configured to perform uplink transmission and downlink transmission.
  • a plurality of carriers may be divided into uplink and downlink.
  • the number of component carriers used in uplink and downlink and the bandwidth of each carrier are the same.
  • an asymmetric carrier aggregation system may be configured by varying the number and bandwidth of carriers used in uplink and downlink.
  • 9- (a) illustrates an example of a carrier aggregation system in which the number of downlink component carriers (CCs) is larger than the number of uplink CCs.
  • Downlink CC # 1 and # 2 correspond to uplink CC # 1
  • downlink CC # 3 and # 4 correspond to uplink CC # 2.
  • 9- (b) shows an example of a carrier aggregation system in which the number of downlink CCs is larger than the number of uplink CCs.
  • the downlink CC # 1 corresponds to the uplink CC # 1 and # 2
  • the downlink CC # 2 corresponds to the uplink CC # 3 and # 4.
  • Each transport block is mapped to only one component carrier.
  • the terminal may be simultaneously mapped to a plurality of component carriers.
  • the backward compatible carrier is a carrier that can be connected to a terminal of all LTE releases including LTE rel-8, LTE-A, and the like.
  • the backward compatible carrier may operate as a single carrier or as a component carrier in a carrier aggregation system.
  • the backward compatibility carrier may always be configured as a pair of downlink and uplink in the FDD system.
  • the non-compatible carrier may not be connected to the terminal of the previous LTE release, but may be connected only to the terminal of the LTE release defining the carrier.
  • a non-compatible carrier may operate as a single carrier or as a component carrier in a carrier aggregation system.
  • a carrier in a carrier set including at least one carrier which may not operate as a single carrier and may operate as a single carrier may be referred to as an extension carrier.
  • cell-specific carrier aggregation systems operated by an arbitrary cell or a base station in a form of using one or more carriers in a carrier aggregation system and a UE-specific operation by a terminal There can be.
  • a cell means one backward compatible carrier or one incompatible backward carrier
  • the term cell specific may be used for one or more carriers including one carrier represented by a cell.
  • the form of a carrier aggregation system in the FDD system is to determine the linkage of the downlink and uplink according to the default Tx-Rx separation defined in LTE rel-8 or LTE-A. Can be.
  • the basic transmit-receive separation in LTE rel-8 is as follows.
  • the carrier frequency in uplink and downlink may be allocated in the range of 0 to 65535 by an E-UTRA absolute radio frequency channel number (EARFCN).
  • E-UTRA absolute radio frequency channel number EARFCN
  • F DL F DL_low +0.1 (N DL -N Offs-DL )
  • F UL F UL_low + 0.1 (N UL -N Offs-UL ).
  • N DL is a downlink EARFCN
  • N UL is an uplink EARFCN.
  • F DL-low , N Offs-DL , F UL-low , and N Offs-UL may be determined by Table 1.
  • Tx channel The separation of the basic E-TURA transmission channel (Tx channel) and the reception channel (Rx channel) can be determined by Table 2.
  • Reference signals are generally transmitted in sequence.
  • the reference signal sequence may use a PSK-based computer generated sequence.
  • PSK include binary phase shift keying (BPSK) and quadrature phase shift keying (QPSK).
  • the reference signal sequence may use a constant amplitude zero auto-correlation (CAZAC) sequence.
  • CAZAC sequences are ZC-based sequences, ZC sequences with cyclic extensions, ZC sequences with truncation, etc. There is this.
  • the reference signal sequence may use a pseudo-random (PN) sequence.
  • PN sequences include m-sequences, computer generated sequences, Gold sequences, and Kasami sequences.
  • the reference signal sequence may use a cyclically shifted sequence.
  • the uplink reference signal may be divided into a demodulation reference signal (DMRS) and a sounding reference signal (SRS).
  • DMRS is a reference signal used for channel estimation for demodulation of a received signal.
  • DMRS may be combined with transmission of PUSCH or PUCCH.
  • the SRS is a reference signal transmitted by the terminal to the base station for uplink scheduling.
  • the base station estimates an uplink channel based on the received sounding reference signal and uses the estimated uplink channel for uplink scheduling.
  • SRS is not combined with transmission of PUSCH or PUCCH.
  • the same kind of base sequence can be used for DMRS and SRS.
  • precoding applied to DMRS in uplink multi-antenna transmission may be the same as precoding applied to PUSCH. Cyclic shift separation is a primary scheme for multiplexing DMRS.
  • the SRS may not be precoded and may also be an antenna specified reference signal.
  • the SRS is a reference signal transmitted from the terminal or the relay station to the base station.
  • the SRS is a reference signal not related to uplink data or control signal transmission.
  • SRS is generally used for channel quality estimation for frequency selective scheduling in uplink, but may be used for other purposes. For example, it can be used for power control, initial MCS selection, or initial power control for data transmission.
  • SRS is generally transmitted in the last SC-FDMA symbol of one subframe.
  • C SRS which is a cell specific SRS transmission bandwidth
  • a cell specific SRS transmission subframe may also be given by an upper layer.
  • B SRS denotes an SRS bandwidth and b hop denotes a frequency hopping bandwidth.
  • N b may be determined by a table predetermined by C SRS and B SRS . to be.
  • the corresponding SC-FDMA symbol may be used for SRS transmission.
  • UpPTS uplink pilot time slot
  • two SC-FDMA symbols may be used for SRS transmission and may be simultaneously assigned to one UE.
  • the terminal When the transmission of the SRS and the transmission of the PUCCH format 2 / 2a / 2b simultaneously occur in the same subframe, the terminal does not always transmit the SRS.
  • the UE does not always transmit the SRS when the SRS transmission and the PUCCH carrying the ACK / NACK and / or the positive SR are performed in the same subframe.
  • the UE uses the shortened PUCCH format when the SRS transmission and the transmission of the PUCCH carrying the ACK / NACK and / or the positive SR are configured in the same subframe. Simultaneously transmit PUCCH and SRS carrying / NACK and / or positive SR.
  • a PUCCH carrying an ACK / NACK and / or a positive SR is configured in a cell-specific SRS subframe
  • a shortened PUCCH format is used and a PUCCH and SRS carrying an ACK / NACK and / or a positive SR are configured. Send simultaneously.
  • the terminal does not transmit the SRS.
  • PRACH physical random access channel
  • AckNackSRS-SimultaneousTransmission determines whether the UE supports simultaneous transmission of PUCCH and SRS carrying ACK / NACK in one subframe. If the UE is configured to simultaneously transmit the PUCCH and SRS carrying the ACK / NACK in one subframe, the UE can transmit the ACK / NACK and SRS in the cell-specific SRS subframe. In this case, a shortened PUCCH format may be used, and transmission of an ACK / NACK or SR corresponding to a location where the SRS is transmitted is omitted (punctured).
  • the reduced PUCCH format is used in a cell specific SRS subframe even when the UE does not transmit an SRS in the corresponding subframe. If the UE is configured not to simultaneously transmit the PUCCH and SRS carrying the ACK / NACK in one subframe, the UE may use the general PUCCH format 1 / 1a / 1b for transmitting the ACK / NACK and the SR.
  • Tables 3 and 4 show examples of a UE-specific SRS configuration indicating T SRS which is an SRS transmission period and T offset which is an SRS subframe offset.
  • SRS transmission period T SRS may be determined by any one of ⁇ 2, 5, 10, 20, 40, 80, 160, 320 ⁇ ms.
  • Table 3 is an example of an SRS configuration in an FDD system.
  • Table 4 is an example of an SRS configuration in a TDD system.
  • n f represents a frame index and k SRS is a subframe index within a frame in the FDD system.
  • K SRS in a TDD system may be determined by Table 5.
  • the UE transmits the PUSCH corresponding to the retransmission of the same transport block as part of the transmission of the SRS and the random access response grant or the contention-based random access procedure.
  • SRS is not always transmitted.
  • Data arrives at a coding unit in the form of at most one transport block every TTI.
  • a CRC is added to a transport block in step S100.
  • the addition of CRC may support error detection for the UL-SCH transport block.
  • All transport blocks can be used to calculate the CRC parity bit.
  • the bits in the transport block passed to layer 1 are a 0 ,... , a A-1 , the parity bits are p 0 ,... can be expressed as L-1 .
  • the size of the transport block is A, the size of the parity bit is L.
  • a 0, which is the smallest order bit of information, may be mapped to the most significant bit (MSB) of the transport block.
  • MSB most significant bit
  • step S110 the transport block to which the CRC is added is segmented into a plurality of code blocks, and a CRC is added to each code block.
  • the bits before being divided into code blocks may be represented by b 0 , ..,. B B-1 , where B is the number of bits in a transport block including a CRC.
  • the bits after the code block division are c r0 ,... , c r (Kr-1) , where r is a code block number and Kr is the number of bits of the code block number r.
  • step S120 channel coding is performed on each code block.
  • the total number of code blocks is C, and channel coding may be performed for each code block separately in a turbo coding scheme.
  • step S130 rate matching is performed on each code block on which channel coding is performed. Rate matching may be performed individually for each code block.
  • the bits after the rate matching are performed are e r0 ,... , e r (Er-1) , where r is a code block number and Er is the number of rate matched bits of the code block number r.
  • each code block on which rate matching is performed is concatenated.
  • the bits after each code block are concatenated into f 0 ,. , f G-1 , where G is the total number of coded transmission bits except bits used for transmission of control information.
  • the control information may be multiplexed with the UL-SCH transmission.
  • step S141 to step S143 channel coding is performed on the control information.
  • the control information may include channel quality information including CQI and / or PMI, HARQ-ACK and RI.
  • CQI includes a PMI.
  • Different control rates are applied to each control information according to the number of different coding symbols.
  • channel coding for CQI, RI and HARQ-ACK is performed independently.
  • the CQI in step S141, the RI in step S142, and the HARQ-ACK are channel coded in step S143, but are not limited thereto.
  • two HARQ-ACK feedback modes of HARQ-ACK bundling and HARQ-ACK multiplexing may be supported by a higher layer.
  • the HARQ-ACK includes one or two information bits.
  • the AHRQ-ACK includes 1 to 4 information bits.
  • the number of coded symbols Q ′ may be determined by Equation 4.
  • Equation 4 O represents the number of HARQ-ACK bits or RI bits, and M sc PUSCH represents the scheduled bandwidth for PUSCH transmission in the current subframe of the transport block as the number of subcarriers.
  • N SRS 1
  • N SRS 0.
  • M sc PUSCH-initial , C and Kr can be obtained from the initial PDCCH for the same transport block. If DCI format 0 in the initial PDCCH for the same transport block does not exist, M sc PUSCH-initial , C and Kr are most recently semi-permanent when the initial PUSCH for the same transport block is scheduled semi-persistent. From the PDCCH allocated semi-persistent, when the PUSCH is initialized from the random access response grant, it can be obtained from the random access response grant for the same transport block.
  • HARQ-ACK In HARQ-ACK transmission, ACK may be encoded as '1' in binary, and NACK may be encoded as '0' in binary. If HARQ-ACK is [o 0 ACK ] including 1 bit information, it may be encoded according to Table 6.
  • x and y are placeholders for scrambling HARQ-ACK bits in a manner to maximize the Euclidean distance of a modulation symbol carrying HARQ-ACK information. placeholder).
  • the bit sequence q 0 ACK ,... q QACK-1 ACK can be obtained by concatenating a plurality of encoded HARQ-ACK blocks.
  • Q ACK is the total number of encoded bits in all encoded HARQ-ACK blocks.
  • the concatenation of the last HARQ-ACK block may be partially performed to match the total length of the bit sequence to Q ACK .
  • Bit sequence for TDD HARQ-ACK bundling mode Can be obtained by concatenating a plurality of encoded HARQ-ACK blocks.
  • Q ACK is the total number of encoded bits in all encoded HARQ-ACK blocks.
  • the concatenation of the last HARQ-ACK block may be partially performed to match the total length of the bit sequence to Q ACK .
  • the scrambling sequence [w 0 ACK w 1 ACK w 2 ACK w 3 ACK ] may be determined by Table 8.
  • bit sequence q 0 ACK ,... q QACK-1 ACK can be obtained from Equation 5.
  • the bit size of the corresponding RI feedback for PDSCH transmission may be determined assuming the maximum number of layers according to the antenna configuration of the base station and the terminal. If the RI is [o 0 RI ] including 1 bit information, it may be encoded according to Table 9.
  • RI is [o 0 RI o 1 RI ] containing 2-bit information
  • o 0 RI corresponds to MSB of 2-bit information
  • 0 1 RI corresponds to LSB (Least Significant Bit0) of 2-bit information
  • RI is It can be encoded according to Table 11.
  • o 2 RI (o 0 RI + o 1 RI ) mod2.
  • mapping of [o 0 RI o 1 RI ] and RI may be given by Table 12.
  • x and y represent placeholders for scrambled RI bits in a way to maximize the Euclidean distance of modulation symbols carrying RI information.
  • Bit sequence q 0 RI ,... q QRI-1 RI can be obtained by concatenating a plurality of encoded RI blocks.
  • Q RI is the total number of encoded bits in all encoded RI blocks.
  • the concatenation of the last RI block may be partially performed to fit the total length of the bit sequence to Q RI .
  • the number Q 'of coded symbols may be determined by Equation 6.
  • N symb PUSCH-initial is the number of SC-FDMA symbols per subframe for initial PUSCH transmission in the same transport block.
  • G N symb PUSCH * M sc PUSCH * Q m -Q CQI -Q RI , where M sc PUSCH is the scheduled bandwidth for the PUSCH transmission in the current subframe of the transport block. It is expressed as a number.
  • N symb PUSCH (2 * (N symb UL ⁇ 1) ⁇ N SRS ).
  • the channel coding of the CQI information is performed by the input sequence o 0 ,. , o based on O-1 If the size of the payload is larger than 11 bits, CRC addition, channel coding and rate matching for CQI information are performed, respectively.
  • the input sequence for the CRC addition process is o 0 ,.... o becomes O-1
  • the output sequence to which the CRC is added becomes the input sequence of the channel coding process, and the output sequence of the channel coding process becomes the input sequence of the rate matching process.
  • the output sequence of the final channel coding of the CQI information is q 0 ,... q Can be expressed as QCQI-1 .
  • step S150 multiplexing of data and control information is performed.
  • the HARQ-ACK information exists in both slots of the subframe and may be mapped to resources around the DMRS.
  • the data and the control information can be mapped to different modulation symbols.
  • CQI information may be multiplexed with data on a UL-SCH transport block having the highest modulation and coding scheme (MCS).
  • channel interleaving is performed.
  • Channel interleaving may be performed in conjunction with PUSCH resource mapping, and modulation symbols may be time first mapped to a transmit waveform by channel interleaving.
  • HARQ-ACK information may be mapped to resources around the uplink DRMS, and RI information may be mapped around resources used by the HARQ-ACK information.
  • the SRS transmission method can be divided into two types. Periodic SRS transmission method that periodically transmits SRS according to the SRS parameter received by radio resource control (RRC) signaling by the method defined in LTE rel-8, and triggers dynamically from the base station. There is an aperiodic SRS transmission method for transmitting an SRS whenever necessary based on a message. In LTE-A, an aperiodic SRS transmission method may be introduced.
  • RRC radio resource control
  • the SRS may be transmitted in a UE-specific SRS subframe determined UE-specifically.
  • a cell-specific SRS subframe is periodically set by a cell-specific SRS parameter, and a periodic UE-specific SRS subframe set by a terminal-specific SRS parameter among cell-specific SRS subframes.
  • the periodic SRS is transmitted.
  • the periodic UE-specific SRS subframe may be a subset of the cell-specific SRS subframe.
  • the cell specific SRS parameter may be given by a higher layer.
  • the aperiodic SRS may be transmitted in an aperiodic UE specific SRS subframe determined by the UE specific aperiodic SRS parameter.
  • the UE-specific SRS subframe of the aperiodic SRS transmission method may be a subset of the cell-specific SRS subframe as defined in LTE rel-8.
  • the aperiodic UE specific SRS subframe may be the same as the cell specific SRS subframe.
  • the UE-specific aperiodic SRS parameter may also be given by an upper layer like the cell-specific SRS parameter.
  • the UE-specific aperiodic SRS subframe may be set by the subframe period and subframe offset of Table 3 or Table 4 described above.
  • PUSCH or PUCCH may be allocated to an SRS subframe.
  • SRS is an aperiodic SRS. However, it is not limited thereto.
  • 11 is an example of configuration of aperiodic SRS and PUSCH in an SRS subframe.
  • the SRS subframe of FIG. 11 is a subframe of any of the UE-specific SRS subframes determined to be UE-specific. Or, if the aperiodic UE-specific SRS subframe is the same as the cell-specifically determined SRS subframe, the SRS subframe of FIG. 11 is one of the cell-specifically determined SRS subframes.
  • the last SC-FDMA symbol of the SRS subframe is allocated for aperiodic SRS transmission, and the PUSCH is allocated to the remaining SC-FDMA symbols to transmit data. That is, uplink data through aperiodic SRS and PUSCH are simultaneously transmitted in an SRS subframe.
  • the PUSCH may be rate matched except for the last SC-FDMA symbol allocated to the aperiodic SRS.
  • the PUSCH transmission in the corresponding SRS subframe can be rate matched to allow PUSCH transmission in the remaining SC-FDMA symbols that do not transmit the aperiodic SRS. have.
  • rate matching is always performed on the PUSCH to eliminate ambiguity.
  • rate matching the PUSCH it is possible to increase the reliability and coverage of the aperiodic SRS transmission while reducing the data rate of one SC-FDMA symbol when transmitting data through the PUSCH.
  • aperiodic SRS transmission it is possible to maintain a single carrier characteristic in the last SC-FDMA symbol of the SRS subframe.
  • the bandwidth occupied by the aperiodic SRS in the last SC-FDMA symbol of the SRS subframe may be the entire system bandwidth, or may be a narrow band or a partial bandwidth. In addition, it may be a terminal specific SRS bandwidth defined in LTE rel-8 / 9, or may be a newly set SRS bandwidth in LTE-A.
  • the bandwidth occupied by the PUSCH in the remaining SC-FDMA symbols is not limited.
  • 12 is an example of configuration of aperiodic SRS and PUCCH in an SRS subframe.
  • the SRS subframe of FIG. 12 is a subframe of any one of UE-specific SRS subframes.
  • the SRS subframe of FIG. 12 is one of the cell-specific SRS subframes. Referring to FIG. 12, when a PUCCH is allocated to an SRS subframe, transmission of aperiodic SRS may be dropped and only UL control information may be transmitted through the PUCCH. Accordingly, a single carrier characteristic can be maintained.
  • a PUSCH and a PUCCH may be simultaneously configured in a subframe. This may be indicated by higher layer signaling. Accordingly, PUSCH and PUCCH may be simultaneously allocated to a UE-specific SRS subframe in which aperiodic SRS may be transmitted. As described above, when the PUSCH is allocated to the UE-specific SRS subframe and when the PUCCH is allocated to the UE-specific SRS subframe, operations related to aperiodic SRS transmission are defined. When PUCCHs are allocated at the same time, an operation related to aperiodic SRS transmission of the UE is not defined. That is, when the UE-specific SRS subframe and the subframes in which the PUSCH and the PUCCH are allocated at the same time overlap, the operation of the UE related to the transmission of the aperiodic SRS needs to be defined.
  • the transmission of the aperiodic SRS is omitted according to the allocation of the PUCCH, and the PUSCH may be rate matched except for the last SC-FDMA symbol of the SRS subframe. That is, it corresponds to a case where a PUSCH is allocated to an SRS subframe in FIG. 11 and a case where a PUCCH is allocated to an SRS subframe in FIG. 12. Due to the single carrier characteristic, aperiodic SRS transmission in the last SC-FDMA symbol is omitted, and UL control information is transmitted through the PUCCH. In addition, since the UE-specific SRS subframe is included in the corresponding subframe, rate matching is always performed on the PUSCH. Although aperiodic SRS is not actually transmitted by the allocation of the PUCCH, rate matching is performed on the PUSCH, so that a certain amount of radio resources may be lost.
  • a PUSCH and a PUCCH are simultaneously allocated to a UE-specific SRS subframe, transmission of aperiodic SRS is omitted and the PUSCH may not be rate matched. That is, aperiodic SRS is not transmitted, and PUCCH and PUSCH may be allocated over all SC-FDMA symbols of the SRS subframe.
  • step S200 the UE transmits the CQI to the base station through the PUCCH allocated in the UE-specific SRS subframe.
  • step S210 the UE transmits UL data on the PUSCH allocated in the SRS subframe.
  • the SRS subframe is a subframe in which the PUSCH and the PUCCH are simultaneously allocated, and the SRS subframe includes an SRS SC-FDMA symbol reserved for SRS transmission.
  • a PUSCH and a PUCCH are simultaneously allocated to an SRS subframe in one CC.
  • the present invention is not limited thereto and the present invention may be applied to a case in which PUSCH and PUCCH are simultaneously allocated to SRS subframes in a plurality of CCs.
  • UL control information is transmitted through a PUCCH allocated to UL CC # 1, and transmission of aperiodic SRS is omitted in UL CC # 1.
  • UL data is transmitted through a PUSCH assigned to UL CC # 2, and rate matching is not performed on the PUSCH.
  • FIG. 14 is a block diagram of a base station and a terminal in which an embodiment of the present invention is implemented.
  • the base station 800 includes a processor 810, a memory 820, and a radio frequency unit (RF) 830.
  • Processor 810 implements the proposed functions, processes, and / or methods. Layers of the air interface protocol may be implemented by the processor 810.
  • the memory 820 is connected to the processor 810 and stores various information for driving the processor 810.
  • the RF unit 830 is connected to the processor 810, transmits and / or receives a radio signal, and transmits a feedback allocation A-MAP IE to the terminal.
  • the terminal 900 includes a processor 910, a memory 920, and an RF unit 930.
  • the RF unit 930 is connected to the processor 910 and transmits uplink data on the SRS and the PUSCH in the SRS subframe.
  • Processor 910 implements the proposed functions, processes, and / or methods. Layers of the air interface protocol may be implemented by the processor 910.
  • the memory 920 is connected to the processor 910 and stores various information for driving the processor 910.
  • Processors 810 and 910 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
  • the memory 820, 920 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium, and / or other storage device.
  • the RF unit 830 and 930 may include a baseband circuit for processing a radio signal.
  • the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
  • the module may be stored in the memory 820, 920 and executed by the processor 810, 910.
  • the memories 820 and 920 may be inside or outside the processors 810 and 910, and may be connected to the processors 810 and 910 by various well-known means.
  • the methods are described based on a flowchart as a series of steps or blocks, but the invention is not limited to the order of steps, and certain steps may occur in a different order or concurrently with other steps than those described above. Can be.
  • the steps shown in the flowcharts are not exclusive and that other steps may be included or one or more steps in the flowcharts may be deleted without affecting the scope of the present invention.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention se rapporte à un procédé et à un dispositif adaptés pour transmettre des données dans un système de communication sans fil. Selon le procédé de la présente invention, un terminal : transmet un indicateur de qualité de voie (CQI, Channel Quality Indicator) à une station de base, via un canal de contrôle physique sur la liaison montante (PUCCH, Physical Uplink Control CHannel) qui est alloué à l'intérieur d'une sous-trame de signal de référence sonore (SRS, Sounding Reference Signal) qui est déterminée d'une manière spécifique à un UE ; et il transmet des données sur la liaison montante (UL, UpLink) via un canal physique partagé sur la liaison montante (PUSCH, Physical Uplink Shared CHannel) qui est alloué à l'intérieur de ladite sous-trame de SRS. Ladite sous-trame de SRS est une sous-trame à laquelle ledit PUSCH et ledit PUCCH sont alloués en même temps, et ladite sous-trame de SRS contient un symbole d'accès multiple par répartition en fréquence à une seule porteuse (SC-FDMA, Single Carrier Frequency Division Multiple Access) qui est réservé à la transmission de SRS.
PCT/KR2012/001403 2011-02-24 2012-02-23 Procédé et dispositif pour transmettre des données dans un système de communication sans fil WO2012115472A2 (fr)

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